When does the check engine indicator light up on an MTV?

The check engine indicator on an MTV (Medium Tactical Vehicle) illuminates as a warning signal to the driver whenever there is an issue that could affect engine performance, emissions, or overall vehicle safety. Specifically, when the psi (pounds per square inch) falls beneath 6, it indicates low oil pressure, which is critical for engine lubrication and can lead to severe engine damage if not addressed promptly.

Maintaining adequate oil pressure is vital; falling below this threshold suggests that the oil pump may not be functioning properly or that the oil level may be too low, both of which require immediate attention to ensure the engine operates effectively and is protected from potential harm.

In contrast, the other options refer to different operational parameters that do not directly trigger the check engine light. For example, excessive engine temperature, high oil pressure, or low coolant levels pertain to other system warnings rather than triggering the check engine signal. Understanding this correlation helps maintain the vehicle's operational readiness and safety.